双污染源对室内浓度场分布影响的数值模拟研究

Numerical simulation on concentration distribution of indoor room with two pollution source

在工业生产过程中会产生大量污染气体,研究污染气体的分布规律将为改善工业室内空气品质奠定一定的基础.通过运用计算流体力学(CFD)方法,对单污染源单独散发和双污染源共同作用的情况进行了数值模拟,分析和比较了单污染源单独散发时污染物浓度场的数值叠加值和双污染源共同作用下的污染物浓度场间的差异,定义并运用了叠加差的概念,分析和比较了室内污染气体的浓度分布,得出单污染源单独散发浓度场的数值叠加值整体要高于双污染源共同作用值,但是在源项上方时双污染源共同作用值要高于单污染源的数值叠加值,所以研究多污染源散发时不能将单污染源进行简单的叠加;并通过改变源项污染物浓度,总结源项浓度对叠加差值的影响.

The industrial production process a large number of polluting gases are be generated.The studying the distribution of pollutants will lay a solid foundation for improving indoor air quality.In this paper,the method of Computational Fluid Dynamics（CFD） is employed to simulate the two pollution sources emission respectively and simultaneously.By defining the concept of superposition difference,the difference between the numerical superimposed concentration field of the single pollution source and the concentration field of the double pollution source that emit simultaneously are analyzed.The numerical results show that the superimposed concentration of the single pollution source is larger than the concentration of the double pollution source as a whole,while above the source,the value of the later is greater than that of the former.Thus the multi sources cannot be treated simply as a superposition of several single sources.Furthermore,by increasing the emitting concentration of the source,the effect of concentration of the source on the superposition difference is summarized.